package com.mol.market.common.widget;

import java.util.ArrayList;

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TabHost;

/**
 * Author: Andrew.Wang
 * Date  : 12-11-19
 */
public class FragmentTabHostImpl extends TabHost
    implements TabHost.OnTabChangeListener {
    private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
    private FrameLayout mRealTabContent;
    private Context mContext;
    private FragmentManager mFragmentManager;
    private int mContainerId;
    private TabHost.OnTabChangeListener mOnTabChangeListener;
    private TabInfo mLastTab;
    private boolean mAttached;

    static final class TabInfo {
        private final String tag;
        private final Class<?> clss;
        private final Bundle args;
        private Fragment fragment;

        TabInfo(String _tag, Class<?> _class, Bundle _args) {
            tag = _tag;
            clss = _class;
            args = _args;
        }
    }

    static class DummyTabFactory implements TabHost.TabContentFactory {
        private final Context mContext;

        public DummyTabFactory(Context context) {
            mContext = context;
        }


        @Override
        public View createTabContent(String tag) {
            View v = new View(mContext);
            v.setMinimumWidth(0);
            v.setMinimumHeight(0);
            return v;
        }
    }

    static class SavedState extends BaseSavedState {
        String curTab;

        SavedState(Parcelable superState) {
            super(superState);
        }

        private SavedState(Parcel in) {
            super(in);
            curTab = in.readString();
        }

        @Override
        public void writeToParcel(Parcel out, int flags) {
            super.writeToParcel(out, flags);
            out.writeString(curTab);
        }


        @Override
        public String toString() {
            return "FragmentTabHost.SavedState{"
                + Integer.toHexString(System.identityHashCode(this))
                + " curTab=" + curTab + "}";
        }

        public static final Parcelable.Creator<SavedState> CREATOR
            = new Parcelable.Creator<SavedState>() {

            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }


            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }

    public FragmentTabHostImpl(Context context) {
        // Note that we call through to the version that takes an AttributeSet,
        // because the simple Context construct can result in a broken object!
        super(context, null);
        initFragmentTabHost(context, null);
    }

    public FragmentTabHostImpl(Context context, AttributeSet attrs) {
        super(context, attrs);
        initFragmentTabHost(context, attrs);
    }

    private void initFragmentTabHost(Context context, AttributeSet attrs) {
        TypedArray a = context.obtainStyledAttributes(attrs,
            new int[] { android.R.attr.inflatedId }, 0, 0);
        mContainerId = a.getResourceId(0, 0);
        a.recycle();

        super.setOnTabChangedListener(this);
    }

    /**
     * @deprecated Don't call the original TabHost setup, you must instead
     * call {@link #setup(Context, FragmentManager)} or
     * {@link #setup(Context, FragmentManager, int)}.
     */
    @Override @Deprecated
    public void setup() {
        throw new IllegalStateException(
            "Must call setup() that takes a Context and FragmentManager");
    }

    public void setup(Context context, FragmentManager manager) {
        super.setup();
        mContext = context;
        mFragmentManager = manager;
        ensureContent();
    }

    public void setup(Context context, FragmentManager manager, int containerId) {
        super.setup();
        mContext = context;
        mFragmentManager = manager;
        mContainerId = containerId;
        ensureContent();
        mRealTabContent.setId(containerId);

        // We must have an ID to be able to save/restore our state.  If
        // the owner hasn't set one at this point, we will set it ourself.
        if (getId() == View.NO_ID) {
            setId(android.R.id.tabhost);
        }
    }

    private void ensureContent() {
        if (mRealTabContent == null) {
            mRealTabContent = (FrameLayout)findViewById(mContainerId);
            if (mRealTabContent == null) {
                throw new IllegalStateException(
                    "No tab content FrameLayout found for id " + mContainerId);
            }
        }
    }

    @Override
    public void setOnTabChangedListener(OnTabChangeListener l) {
        mOnTabChangeListener = l;
    }

    public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
        tabSpec.setContent(new DummyTabFactory(mContext));
        String tag = tabSpec.getTag();

        TabInfo info = new TabInfo(tag, clss, args);
//
//        if (mAttached) {
//            // If we are already attached to the window, then check to make
//            // sure this tab's fragment is inactive if it exists.  This shouldn't
//            // normally happen.
//            info.fragment = mFragmentManager.findFragmentByTag(tag);
//            if (info.fragment != null && !info.fragment.isDetached()) {
//                FragmentTransaction ft = mFragmentManager.beginTransaction();
//                ft.detach(info.fragment);
//                ft.commit();
//            }
//        }

        mTabs.add(info);
        addTab(tabSpec);
    }

//    @Override
//    protected void onAttachedToWindow() {
//        super.onAttachedToWindow();
//
//        String currentTab = getCurrentTabTag();
//
//        // Go through all tabs and make sure their fragments match
//        // the correct state.
//        FragmentTransaction ft = null;
//        for (int i=0; i<mTabs.size(); i++) {
//            TabInfo tab = mTabs.get(i);
//            tab.fragment = mFragmentManager.findFragmentByTag(tab.tag);
//            if (tab.fragment != null && !tab.fragment.isDetached()) {
//                if (tab.tag.equals(currentTab)) {
//                    // The fragment for this tab is already there and
//                    // active, and it is what we really want to have
//                    // as the current tab.  Nothing to do.
//                    mLastTab = tab;
//                } else {
//                    // This fragment was restored in the active state,
//                    // but is not the current tab.  Deactivate it.
//                    if (ft == null) {
//                        ft = mFragmentManager.beginTransaction();
//                    }
//                    ft.detach(tab.fragment);
//                }
//            }
//        }
//
//        // We are now ready to go.  Make sure we are switched to the
//        // correct tab.
//        mAttached = true;
//        ft = doTabChanged(currentTab, ft);
//        if (ft != null) {
//            ft.commit();
//            mFragmentManager.executePendingTransactions();
//        }
//    }
//
//    @Override
//    protected void onDetachedFromWindow() {
//        super.onDetachedFromWindow();
//        mAttached = false;
//    }

    @Override
    protected Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState ss = new SavedState(superState);
        ss.curTab = getCurrentTabTag();
        return ss;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        SavedState ss = (SavedState)state;
        super.onRestoreInstanceState(ss.getSuperState());
        setCurrentTabByTag(ss.curTab);
    }

    @Override
    public void onTabChanged(String tabId) {

//        if (mAttached) {
//            FragmentTransaction ft = doTabChanged(tabId, null);
//            if (ft != null) {
//                ft.commit();
//            }
//        }
        if (mOnTabChangeListener != null) {
            mOnTabChangeListener.onTabChanged(tabId);
        }
    }

    public Fragment getFragmentByIndex(int position) {
        return mTabs.get(position).fragment;
    }

    public int getFragmentByTab(String tabId) {
        for (int i=0; i<mTabs.size(); i++) {
            if (mTabs.get(i).tag == tabId) {
                return i;
            }
        }
        return 0;
    }

    private FragmentTransaction doTabChanged(String tabId, FragmentTransaction ft) {
        TabInfo newTab = null;
        for (int i=0; i<mTabs.size(); i++) {
            TabInfo tab = mTabs.get(i);
            if (tab.tag.equals(tabId)) {
                newTab = tab;
            }
        }
        if (newTab == null) {
            throw new IllegalStateException("No tab known for tag " + tabId);
        }
        if (mLastTab != newTab) {
            if (ft == null) {
                ft = mFragmentManager.beginTransaction();
            }
            if (mLastTab != null) {
                if (mLastTab.fragment != null) {
                    ft.detach(mLastTab.fragment);
//                    ft.remove(mLastTab.fragment);
//                    mLastTab.fragment = null;
                }
            }
            if (newTab != null) {
                if (newTab.fragment == null) {
                    newTab.fragment = Fragment.instantiate(mContext,
                        newTab.clss.getName(), newTab.args);
                    ft.add(mContainerId, newTab.fragment, newTab.tag);
                } else {
                    ft.attach(newTab.fragment);
                }
            }
            mLastTab = newTab;
        }
        return ft;
    }
}

